Teachers at both sites voted for further industrial action on Tuesday.

The teachers' concerns are the lack of financial incentives to attract and retain appropriately qualified teachers to Griffith; the reduced leadership with one principal across two sites and the negative impact this has on education and the lack of time provided to merge the schools.

At the Griffith High site, teachers were joined by Member for Murray Helen Dalton and P&C president Joy Geddes.

Ms Geddes encouraged both parents and community members to support a petition to demand action on incentives to attract teaching staff to Griffith, and having a principal at both sites in addition to the current executive principal.

"Parents and the community need to get on board and support our educators," she said.

Ms Geddes said the incentives weren't only for the high school, but for all the schools in Griffith and it was an issue that teachers had wanted to see action on for many years.

She said talk about teacher vacancies at Murrumbidgee High School was affecting morale and student learning.

"I'm at a loss, it's something we have to address. What's concerning is the rumours around the number of vacancies at the school is affecting students first."

Mrs Dalton said the situation at MRHS was "desperate".

"It was a great to see such strong support for this industrial action," Mrs Dalton said.

"I was told 90 per cent of available teachers walked out. Now is the time for the community to get behind our teachers at children.

"I'd urge everyone to sign the petition for Griffith schools to offer teachers the same incentives as other schools in this region."

NSW Teachers Federation organiser Brett Bertalli said teachers were at breaking point.

"Teachers, students and parents of Griffith have suffered the inferior model of secondary education for two years," Mr Bertalli said.

"The department has failed to staff the school appropriately since its inception with constant classroom teacher and executive vacancies requiring the school to collapse thousands of lessons and provide minimal supervision in the playground.

"Enough is enough, our students deserve better than this."

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Mr Bertalli said teachers felt there was no other option, other than to show their resolve on Tuesday.

"For two years teachers have acted professionally and responsibly while raising concerns with the Minister for Education," he said.

"Teachers feel they now have no other option but to stop work to demonstrate how serious they are about resolving the matters that are impacting negatively on the education of students.

"Teachers will meet again in week two of term one, 2021 to consider rolling stop work meetings if the state government does not provide appropriate levels of staffing and resources to the school community."